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United States Patent | 5,672,173 |
Gough ,   et al. | September 30, 1997 |
An ablation treatment apparatus has a multiple antenna device with a primary antenna and a secondary antenna. The secondary antenna is positioned in a lumen of the primary antenna as the primary antenna is introduced through tissue to a selected tissue site. At the tissue site the secondary antenna is deployed from the primary antenna in a lateral direction relative to a longitudinal axis of the primary antenna. At least a portion of a distal end of the secondary antenna is structurally less rigid than the primary antenna. The primary antenna is constructed to be rigid enough to be introduced and advanced through tissue. A cable couples the energy source to one or more of the antennas.
Inventors: | Gough; Edward J. (Menlo Park, CA); Stein; Alan A. (Moss Beach, CA) |
Assignee: | Rita Medical Systems, Inc. (Mountain View, CA) |
Appl. No.: | 576436 |
Filed: | December 19, 1995 |
Current U.S. Class: | 606/41; 606/42; 606/45; 606/48; 607/101; 607/102 |
Intern'l Class: | A61B 017/39 |
Field of Search: | 606/41,42,45-50 607/100-102,154,156 128/642 |
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